Development of noncontact measurement methods using multiple laser displacement sensors for bending and torsional vibration stresses in piping systems

Maekawa, Akira; Noda, Michiyasu; Shintani, Masanori; Suzuki, Masuo

doi:10.1016/j.ijpvp.2015.05.002

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…The magnetic-electric sensor or encoder is used to pick up the torsional vibration signals. The signals are then collected by a noncontact torsional vibration meter [10] which can transform the vibration signal from time domain to frequency domain. Such test system is illustrated in Figure 3 [11].…”

Section: Torsional Vibration Test Of the Diesel Propulsion Shaftingmentioning

confidence: 99%

Online Identification and Verification of the Elastic Coupling Torsional Stiffness

Chai

Wang

et al. 2016

Shock and Vibration

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To analyze the torsional vibration of a diesel engine shaft, the torsional stiffness of the flexible coupling is a key kinetic parameter. Since the material properties of the elastic element of the coupling might change after a long-time operation due to the severe working environment or improper use and the variation of such properties will change dynamic feature of the coupling, it will cause a relative large calculation error of torsional vibration to the shaft system. Moreover, the torsional stiffness of the elastic coupling is difficult to be determined, and it is inappropriate to measure this parameter by disassembling the power unit while it is under normal operation. To solve these problems, this paper comes up with a method which combines the torsional vibration test with the calculation of the diesel shafting and uses the inherent characteristics of shaft torsional vibration to identify the dynamic stiffness of the elastic coupling without disassembling the unit. Analysis results show that it is reasonable and feasible to identify the elastic coupling dynamic torsional stiffness with this method and the identified stiffness is accurate. Besides, this method provides a convenient and practical approach to examine the dynamic behavior of the long running elastic coupling.

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Section: Torsional Vibration Test Of the Diesel Propulsion Shaftingmentioning

confidence: 99%

Online Identification and Verification of the Elastic Coupling Torsional Stiffness

Chai

Wang

et al. 2016

Shock and Vibration

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“…Second, nondestructive or noninvasive optical methods such as multiple laser displacement sensors which are applied to piping systems [5], stress measurements using crystal curvature technique during film growths [6], and another technique called deflectometry [7,8], in which light passes through arrays that measure the curvature of objects; they are proposed as mirrors. The reflection caused by these objects is seen in a CCD camera, and the pattern is studied with standard phase shift techniques; most of the used objects are aspherical.…”

Section: Introductionmentioning

confidence: 99%

Digital Image Processing Applied to Optical Measurements

Saldaña-Heredia¹,

Aguilar²,

Lara³

et al. 2020

Digital Imaging

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Digital image processing is a useful tool that improves pictorial information for human interpretation and is mainly used for storage, transmission, and representation of different data. In this chapter, we want to introduce an optical technique which couples physical analysis with image processing for a measurement system. Optical methods were used to obtain the stress-strain relation by different invasive and noninvasive methods. This chapter talks about a novel noninvasive methodology to measure stress-strain evolution; this technique is based upon a single laser beam reflected on the cross section of ductile materials (steel and aluminum) while they are under a compression load. The way we measure one laser beam is by using the Gaussian beam propagation equations; we propose that the reflection area of the laser is going to change as the material surface area is compressed and we analyze these differences by using digital image processing. With this technique we are able to construct a stress-strain diagram.

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“…Laser-based measurements have been widely used over the years with different arrays and applications; those optical systems can measure through destructive and non-destructive procedures [1][2][3][4]. This paper is focused on a non-destructive technique that helps to calculate the relative motion using a laser light reflection adopting an image-matching methodology.…”

Section: Introductionmentioning

confidence: 99%

Optical Characterization of a Pendular Impact

et al. 2020

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We present a simple but accurate correlation between an experimental characterization and a simple analytical prediction of a wave propagation induced by the impact of a pendulum in a box filled with fine sand; this research is based on optical measurements and was carried out using the digital image correlation technique to determine the motion on the surface of the box visually observed by the reflection of the laser. We suggest that the reaction to the impact in the body will be similar to an equivalent damped mass-spring system, obtaining an average error of 3.67208 × 10 −4 .

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Development of noncontact measurement methods using multiple laser displacement sensors for bending and torsional vibration stresses in piping systems

Cited by 13 publications

References 13 publications

Online Identification and Verification of the Elastic Coupling Torsional Stiffness

Online Identification and Verification of the Elastic Coupling Torsional Stiffness

Digital Image Processing Applied to Optical Measurements

Optical Characterization of a Pendular Impact

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